基于红外频闪光的相位分辨自旋波显微术
Phase-resolving spin-wave microscopy using infrared strobe light
AI总结：
针对混合磁振子系统中磁化动力学探测及量子磁振子学对磁振子相位检测的需求，本文提出基于1550nm红外频闪光的光学技术，实现空间与相位分辨的光谱成像，为相关研究提供通用探测平台。
摘要：
在研究新型混合磁振子系统等多种场景中，对磁化动力学进行灵敏且可靠探测的需求日益增长，这类系统中自旋动力学与微波光子、光光子或声子等其他激发强且相干耦合。量子磁振子学的最新进展也凸显了将磁振子相位作为量子态变量的需求，需在片上微纳尺度磁振子器件中高精度检测与映射。本文展示了一种简便的光学技术，利用1550 nm波长的红外频闪光，可直接同时实现空间分辨与相位分辨的光谱及成像功能。为展示该方法，我们对坡莫合金（Permalloy）与钇铁石榴石（Y3Fe5O12，YIG）双层结构中相位分辨的自旋动力学进行了光谱研究，并在偶极自旋波区对YIG的后向体自旋波模式进行了空间成像。利用频闪光探针，检测到的进动相位对比度可直接用于构建自旋波波前图，适用于自旋波传播的连续波区及稳态，无需任何光学参考路径。通过选择外加磁场、频率和检测相位，自旋波图像可对进动振幅和相位敏感。我们的结果表明，红外光学频闪光可作为磁化动力学磁光探测的通用平台，对混合磁振子系统的研究具有潜在意义。
英文摘要：
The needs for sensitively and reliably probing magnetization dynamics have been increasing in various contexts such as studying novel hybrid magnonic systems, in which the spin dynamics strongly and coherently couple to other excitations, including microwave photons, light photons, or phonons. Recent advances in quantum magnonics also highlight the need for employing magnon phase as quantum state variables, which is to be detected and mapped out with high precision in on-chip micro- and nano-scale magnonic devices. Here, we demonstrate a facile optical technique that can directly perform concurrent spectroscopic and imaging functionalities with spatial- and phase-resolutions, using infrared strobe light operating at 1550-nm wavelength. To showcase the methodology, we spectroscopically studied the phase-resolved spin dynamics in a bilayer of Permalloy and Y3Fe5O12 (YIG), and spatially imaged the backward volume spin wave modes of YIG in the dipolar spin wave regime. Using the strobe light probe, the detected precessional phase contrast can be directly used to construct the map of the spin wave wavefront, in the continuous-wave regime of spin-wave propagation and in the stationary state, without needing any optical reference path. By selecting the applied field, frequency, and detection phase, the spin wave images can be made sensitive to the precession amplitude and phase. Our results demonstrate that infrared optical strobe light can serve as a versatile platform for magneto-optical probing of magnetization dynamics, with potential implications in investigating hybrid magnonic systems.
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